Locomotive-throttle for superheating devices.



w.'1. McLEAN. I VE TIIHOTI-LE FOR ISU IERHEATING QEVICES.'

LOCOMOTI APPLICATION FILED .IUNE9: 191T- Patented Sept. 17,1918.

Q00 08 anuwtoz 80 00 c mi L I M g I I r a I? 0% Roman To all whom it may concern:

. Be it known that I,-ll"1LLiA:u J. MCLEAN, a citizen of the United States, and resident e ofi. Bellingham, W hatcoi'n county, State of 5 lV'ashin 'ton, have invented certain new and useful IDIJI'QVEIDEHtS in Locomotive-Throttles for Superheatin Devices, of which the following. is a speci cation. i I Myiinvention relates to superheating de- 10 vices as ,used on locomotives, and comprises certain improvements in connection with the throttleand its location, whereby the superheating pipes are, at all times, kept filled is unnecessary .to cut the tof the heating system standing still. 'e ;featui'es-=o;f novelty in this invention H e.hereinafter described and then parlarly pointed out'in the claim In the accompanying drawings I have shown my dev'ice'in thetorm of construction which is now most preferred by' me.

Figure 1 is a transverse section taken upon "an irregular plane through the smoke box and the'parts of the superheate'r of a locomotive having my improvements em-lmdied therein, 1

.ig. fllis a longitudinal section also taken upon an irregular plane and showing the same parts.

I have shown my inventionas applied to a type of superheatcr for loeomotivefboilers in which a certain section of the space of the boiler occupied by the'flues. is provided-with fines of a larger size than those ordinarily used and inpall of which fines are placed ,smaller pipes, which pipes act as the superheater, and through which all the ,steam drawn from. the'boiler is passed on its way to the engine cylinders. Inthe drawings, 1 represents the shell of [the boiler and the ordinary fines thereof. v. A. portion of these in the upper and central of the boiler, are replaced byflues, 2, here of a larger size. Each of these tlhes 2 are shown as provided with four superheating pipes 20, whichpipes are c0.n "nee-ted at the ends Where the return is made L Mby return bends 21.

he collecting pipe 3 is, or may be, of the -type nr construction ordinarily employed in locomotives In the usual type of construe ti on the tl'n'ottle valve placed at thereceiw U end-ofthis pipe, that is, within the boiler Ma lia oent the steam dome. The other end of this pipe,as;it emerges through the front LOCOMOTIVE-THROTTLEIOR sUrIqRHEA'rme DEVICES.

Specification of Letters Patent.

Application filed June 9, 1917. Serial No. 173,899.

UNITED STATES PATENT oFFIoL.

WILLIAM J. MGLEAN, 0 BELLINGKHAM, WASHINGT ON.

Patented Sept. 17, 19 18.

tu e-sheet ll,is causedtoenter a lieader nth ch header is provided with a p assag 3f:

cxttmding longtlnvise theheader and "t1 connected with the superheating pipes; all of the tines In addition, this he leais'prorided with anothersiniilarpassag 321' of substantinally the some extent, and X- tending in thesame direction. Each o e l these passages, 31 and lfl, is connected, with its n'ni'ticular so of.passa,qe which extend transversely of the heade with which the super-heating pipes 2 connected by upwardly extending en One end of each of these superheating pipes 20 is thus connected with the passage and its other end with the passage "In consequence, the steam flowing from the ol looting pipe 3 enters one end of "all 0. the 7.5 sruuerheating pipes 20, passes anew me and bar; and discharges intot he of set of chambers 33, which connect niitl other passage 52, and this passage, is nected with the down pipes-4, which (loud c the steam-to the enginerylinders. T' these pipes 4 :lltl' employed, each supplyril the engine on the respective side oft-heomotive. a i

iTllB aboveconstruction of lllQ'llQfldBl is 35 the construction which has been previously employed. It has, however. been custol nhrry i;- hereto to connect the down pipes 4 fro' ln the header to the engine, directly with the header without the intervention at thy valve. Instead of doing this, I filzldTa throttle'valve. 5 in the connection between the down pipes 4: and the header. I thus employ. as herein shown, twothrot'tle valves,

verselyfacross' the boiler, in, posit-ion t-o bel 8b one 'for each side of theengin'e. The stems l 50 of these throttle valves extend upward through suitableguides 51 carried by the shell of the smoke box 13 and are engaged for operation in any manner which is found suitable. -The two throttles at opposite sides of the locomotive should be connected so as to work synchronously. The n'leans which I have illustrated for doing this consistfin mounting'a shaft 7 to extend across the top1 05 oi the sn'ioko box and providing this with two crank arms 70, which. engage, each with the. rod 50 of one of the throttle valves. 'lhis shaft may be operated'by means of a crank arm 71 and a rod- 72 which extends 1 10 7 backward to the cab and which is actuatedin any suitable manner. f

By reason of locating the throttle valves at the point iilustrated namely, between the super-heater and the engine cylinder, the

superheatine pipes may at all times be kept 6 full of steam and the danger of burning 10 vide adamper to close the space between the battle plate ('5 and the tube sheet 11, so that when the throttle valve is closed, the tines :2 in which the superheating laced, are closed and the hot gases of -coinmstion from the furnace do not act upon these pipes. In consequence, a large per eentage of the heating 'apaeity of the engine is cut out. This part of the engine must be cut out while steam is being raised and also while the engine standing still and not working, or 'the superheating pipes will be burned out.

By plaring the throttle valve in the manuer herein described, thebenel'it of this heating surface may'be obtained while getting up steam, It is, of course, evident that a single throttle. valve might be employed, espcciallyit this throttle valve is so con structed as to deliver steam to both engine cylinders. It should. however, be located between the superheater and the engine cylii-iders, 'ather than between the boiler and the st perheater. The balile plate (5 forms a part of a casing which comprises a bottom (5 and a perforate. front wall (5." the entrance to the stack :41 being located within said easing and the throttle valves 5 likewise being located within said casing. The location of pipes are the parts in the manner deseritel causes the products of combustion assing through liues 2 to pass, downward y over the portions 22 of the super-heating pipes, thenee through the front wall (5" a'ndout through stack k. he throttle valves are located in a proected position. within the-casing and at sudh a high level that the hottest and dr vesl oi the steam is delivered to the engine i,: vlinders.

What I claim as nry invention is:

In a locomotive construction, the combination with the boiler, and its smoke box, of a plurality of superheating pipes extending through some of the. boiler flue-s, a casing spaced from the trout tube sheet of the boiler and located within the smoke box, a two chamber header located transversely of the boiler and between the front tube sheet and the casing and above the plane of the snperhcating pipes. the opposite ends of the superheatiue' tubes being respectively eonuecied with the chambers of the header, a pair ofthrottle valves located within the casing and located substantially in the plane oi the header. connections between the casings of said valves and one of the chambers of the header. means to supply steam from the boiler to'the other chamber of the header, means for conducting;- steam from the throttle valves to the cylinders of the loco-v motive and means located outside of the 'smokebox and projecting thereinto for controlling the throttle valves.

Signed at len'tictou. l). Canada this tir t da oi June, 1917.

\YTLLTA M J, MCLEA N. 

